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annotate libtommath/bn_mp_prime_rand.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +0800
parents 1051e4eea25a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1692
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
1 #include "tommath_private.h"
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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2 #ifdef BN_MP_PRIME_RAND_C
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
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4 /* SPDX-License-Identifier: Unlicense */
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5
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6 /* makes a truly random prime of a given size (bits),
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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7 *
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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8 * Flags are as follows:
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9 *
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10 * MP_PRIME_BBS - make prime congruent to 3 mod 4
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
11 * MP_PRIME_SAFE - make sure (p-1)/2 is prime as well (implies MP_PRIME_BBS)
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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parents:
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12 * MP_PRIME_2MSB_ON - make the 2nd highest bit one
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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diff changeset
13 *
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
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14 * You have to supply a callback which fills in a buffer with random bytes. "dat" is a parameter you can
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
15 * have passed to the callback (e.g. a state or something). This function doesn't use "dat" itself
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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parents:
diff changeset
16 * so it can be NULL
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
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diff changeset
17 *
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Steffen Jaeckel <s@jaeckel.eu>
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18 */
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19
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diff changeset
20 /* This is possibly the mother of all prime generation functions, muahahahahaha! */
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21 mp_err s_mp_prime_random_ex(mp_int *a, int t, int size, int flags, private_mp_prime_callback cb, void *dat)
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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22 {
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23 unsigned char *tmp, maskAND, maskOR_msb, maskOR_lsb;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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24 int bsize, maskOR_msb_offset;
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25 mp_bool res;
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26 mp_err err;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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27
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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28 /* sanity check the input */
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29 if ((size <= 1) || (t <= 0)) {
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30 return MP_VAL;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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31 }
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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32
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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33 /* MP_PRIME_SAFE implies MP_PRIME_BBS */
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34 if ((flags & MP_PRIME_SAFE) != 0) {
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35 flags |= MP_PRIME_BBS;
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36 }
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37
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38 /* calc the byte size */
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39 bsize = (size>>3) + ((size&7)?1:0);
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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40
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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41 /* we need a buffer of bsize bytes */
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42 tmp = (unsigned char *) MP_MALLOC((size_t)bsize);
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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43 if (tmp == NULL) {
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Steffen Jaeckel <s@jaeckel.eu>
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44 return MP_MEM;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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45 }
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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46
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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47 /* calc the maskAND value for the MSbyte*/
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48 maskAND = ((size&7) == 0) ? 0xFFu : (unsigned char)(0xFFu >> (8 - (size & 7)));
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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49
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50 /* calc the maskOR_msb */
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51 maskOR_msb = 0;
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52 maskOR_msb_offset = ((size & 7) == 1) ? 1 : 0;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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53 if ((flags & MP_PRIME_2MSB_ON) != 0) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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54 maskOR_msb |= (unsigned char)(0x80 >> ((9 - size) & 7));
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55 }
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56
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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57 /* get the maskOR_lsb */
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58 maskOR_lsb = 1u;
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59 if ((flags & MP_PRIME_BBS) != 0) {
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60 maskOR_lsb |= 3u;
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61 }
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62
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63 do {
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64 /* read the bytes */
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65 if (cb(tmp, bsize, dat) != bsize) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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66 err = MP_VAL;
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67 goto error;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
68 }
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diff changeset
69
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70 /* work over the MSbyte */
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71 tmp[0] &= maskAND;
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72 tmp[0] |= (unsigned char)(1 << ((size - 1) & 7));
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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diff changeset
73
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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parents:
diff changeset
74 /* mix in the maskORs */
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75 tmp[maskOR_msb_offset] |= maskOR_msb;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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parents:
diff changeset
76 tmp[bsize-1] |= maskOR_lsb;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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diff changeset
77
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diff changeset
78 /* read it in */
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Steffen Jaeckel <s@jaeckel.eu>
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diff changeset
79 /* TODO: casting only for now until all lengths have been changed to the type "size_t"*/
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
80 if ((err = mp_from_ubin(a, tmp, (size_t)bsize)) != MP_OKAY) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
81 goto error;
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Steffen Jaeckel <s@jaeckel.eu>
parents:
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82 }
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
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83
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
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84 /* is it prime? */
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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parents:
diff changeset
85 if ((err = mp_prime_is_prime(a, t, &res)) != MP_OKAY) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
86 goto error;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
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87 }
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
88 if (res == MP_NO) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
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89 continue;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
90 }
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Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
91
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
92 if ((flags & MP_PRIME_SAFE) != 0) {
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parents:
diff changeset
93 /* see if (a-1)/2 is prime */
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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parents:
diff changeset
94 if ((err = mp_sub_d(a, 1uL, a)) != MP_OKAY) {
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parents:
diff changeset
95 goto error;
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parents:
diff changeset
96 }
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Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
97 if ((err = mp_div_2(a, a)) != MP_OKAY) {
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parents:
diff changeset
98 goto error;
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Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
99 }
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Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
100
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Steffen Jaeckel <s@jaeckel.eu>
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101 /* is it prime? */
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102 if ((err = mp_prime_is_prime(a, t, &res)) != MP_OKAY) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
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103 goto error;
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Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
104 }
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
105 }
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Steffen Jaeckel <s@jaeckel.eu>
parents:
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106 } while (res == MP_NO);
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
107
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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diff changeset
108 if ((flags & MP_PRIME_SAFE) != 0) {
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parents:
diff changeset
109 /* restore a to the original value */
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Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
110 if ((err = mp_mul_2(a, a)) != MP_OKAY) {
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parents:
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111 goto error;
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Steffen Jaeckel <s@jaeckel.eu>
parents:
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112 }
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Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
113 if ((err = mp_add_d(a, 1uL, a)) != MP_OKAY) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
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114 goto error;
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Steffen Jaeckel <s@jaeckel.eu>
parents:
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115 }
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Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
116 }
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Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
117
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Steffen Jaeckel <s@jaeckel.eu>
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118 err = MP_OKAY;
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Steffen Jaeckel <s@jaeckel.eu>
parents:
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119 error:
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
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120 MP_FREE_BUFFER(tmp, (size_t)bsize);
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parents:
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121 return err;
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Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
122 }
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Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
123
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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parents:
diff changeset
124 static int s_mp_rand_cb(unsigned char *dst, int len, void *dat)
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Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
125 {
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Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
126 (void)dat;
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Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
127 if (len <= 0) {
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
diff changeset
128 return len;
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents:
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129 }
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130 if (s_mp_rand_source(dst, (size_t)len) != MP_OKAY) {
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131 return 0;
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132 }
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133 return len;
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134 }
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135
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136 mp_err mp_prime_rand(mp_int *a, int t, int size, int flags)
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137 {
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138 return s_mp_prime_random_ex(a, t, size, flags, s_mp_rand_cb, NULL);
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139 }
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140
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141 #endif